I want to make a 6.8 bolt gun. I understand that most any of the rifles with the threaded barrel are candidates. 223 and 204 seem to be the likely calibers to work with, as the magazines are similar and all that's needed is a barrel and bolt face. I want to make a 16" barrel gun. The 6.8 shoots very well with a short barrel in ar15 and contender. But bolt guns tend to be really expensive and most makers have discontinued. Any help would be appreciated. Could I start with an axis? I have one in 308 with camo stock that I enjoy.